20110777 Ver 1_Staff Comments_20110920

Lucas, Annette
From: Lucas, Annette
Sent: Tuesday, September 20, 2011 11:40 AM
To: Witherspoon, Lauren
Subject: Batts Farm II
Attachments: 11-0777 Batts Farm.docx
Lauren,
Here is my comment about the design of the LS-VFS.
Thanks,
Annette
Annette M. Lucas, PE
Environmental Engineer
NCDENR DWQ Wetlands and Stormwater Branch
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mail)
512 N. Salisbury St, Raleigh, NC 27604 1 9th Floor (L()cation &, Parcels)
Phone: [phone] Fax: [phone] Email: Anuettc Luc?i?d'nt ti??lt.gol'
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11-0777 Batts Farm
AML comments
September 20, 2011
1. Per Table 8-1 in the BMP Manual, a level spreader-engineered filter strip should be designed to
handle the 10-year storm discharge up to 10 cfs. Therefore, the level spreader should be
enlarged to a minimum of 79 feet in length so that it will be capable of treating the peak
discharge from the wet detention pond during the 10-year storm (7.9 cfs).